Merge f04678e407 into 2ba051b59b

Although the issue refers to deselecting MovingPixelsState, the same
crash could happen when canceling/finishing WritingTextState or
MovingSelectionState. This fixes the crash for all these states.

src/app/ui/editor/brush_preview.cpp

@@ -1,5 +1,5 @@
 // Aseprite
-// Copyright (C) 2019-2024  Igara Studio S.A.
+// Copyright (C) 2019-2025  Igara Studio S.A.
 // Copyright (C) 2001-2018  David Capello
 //
 // This program is distributed under the terms of
@@ -457,6 +457,8 @@ void BrushPreview::show(const gfx::Point& screenPos)
 
       // Here we re-use the cached surface
       if (!cached && m_uiLayer->surface()) {
+        m_uiLayer->surface()->clear();
+
         gfx::Rect layerBounds = m_uiLayer->surface()->bounds();
         ui::Graphics g(display, m_uiLayer->surface(), 0, 0);
 

src/app/ui/editor/editor.cpp

@@ -58,6 +58,7 @@
 #include "app/util/tile_flags_utils.h"
 #include "base/chrono.h"
 #include "base/convert_to.h"
+#include "base/scoped_value.h"
 #include "doc/doc.h"
 #include "doc/mask_boundaries.h"
 #include "doc/slice.h"
@@ -266,6 +267,23 @@ void Editor::setStateInternal(const EditorStatePtr& newState)
 {
   m_brushPreview.hide();
 
+  // Some onLeaveState impls (like the ones from MovingPixelsState,
+  // WritingTextState, MovingSelectionState) might generate a
+  // Tx/Transaction::commit(), which will add a new undo state,
+  // triggering a sprite change scripting event
+  // (SpriteEvents::onAddUndoState). This event could be handled by an
+  // extension and that extension might want to save the current
+  // sprite (e.g. calling Sprite_saveCopyAs, the kind of extension
+  // that takes snapshots after each sprite change). That will be a
+  // new Context::executeCommand() for the save command, generating a
+  // BeforeCommandExecution signal, getting back to onLeaveState
+  // again. In that case, we just ignore the reentry as the first
+  // onLeaveState should handle everything (to avoid an stack
+  // overflow/infinite recursion).
+  if (m_leavingState)
+    return;
+  base::ScopedValue leaving(m_leavingState, true);
+
   // Fire before change state event, set the state, and fire after
   // change state event.
   EditorState::LeaveAction leaveAction = m_state->onLeaveState(this, newState.get());

src/app/ui/editor/editor.h

@@ -1,5 +1,5 @@
 // Aseprite
-// Copyright (C) 2018-2024  Igara Studio S.A.
+// Copyright (C) 2018-2025  Igara Studio S.A.
 // Copyright (C) 2001-2018  David Capello
 //
 // This program is distributed under the terms of
@@ -458,6 +458,13 @@ private:
 
   DocView* m_docView;
 
+  // Special flag to avoid re-entering a new state when we are leaving
+  // the current one. This avoids an infinite onLeaveState() recursion
+  // in some special cases when an extension (third-party code)
+  // creates a new sprite change in the same sprite change scripting
+  // event.
+  bool m_leavingState = false;
+
   // Last known mouse position received by this editor when the
   // mouse button was pressed. Used for auto-scrolling. To get the
   // current mouse position on the editor you can use

src/app/ui/editor/moving_slice_state.cpp

@@ -428,8 +428,8 @@ bool MovingSliceState::onMouseMove(Editor* editor, MouseMessage* msg)
   if (editor->slicesTransforms())
     drawExtraCel();
 
-  // Redraw the editor.
-  editor->invalidate();
+  // Notify changes
+  m_site.document()->notifyGeneralUpdate();
 
   // Use StandbyState implementation
   return StandbyState::onMouseMove(editor, msg);

src/doc/brush.cpp

@@ -1,5 +1,5 @@
 // Aseprite Document Library
-// Copyright (C) 2019-2024  Igara Studio S.A.
+// Copyright (C) 2019-2025  Igara Studio S.A.
 // Copyright (C) 2001-2016  David Capello
 //
 // This file is released under the terms of the MIT license.
@@ -20,11 +20,12 @@
 #include "doc/primitives.h"
 
 #include <algorithm>
+#include <atomic>
 #include <cmath>
 
 namespace doc {
 
-static int generation = 0;
+static std::atomic<int> g_generation = 0;
 
 Brush::Brush()
 {
@@ -300,7 +301,7 @@ void Brush::setCenter(const gfx::Point& center)
 // Cleans the brush's data (image and region).
 void Brush::clean()
 {
-  m_gen = ++generation;
+  m_gen = ++g_generation;
   m_image.reset();
   m_maskBitmap.reset();
   m_backupImage.reset();

src/ui/entry.cpp

@@ -128,6 +128,15 @@ int Entry::lastCaretPos() const
   return int(m_boxes.size() - 1);
 }
 
+gfx::Point Entry::caretPosOnScreen() const
+{
+  const gfx::Point caretPos = getCharBoxBounds(m_caret).point2();
+  const os::Window* nativeWindow = display()->nativeWindow();
+  const gfx::Point pos = nativeWindow->pointToScreen(caretPos + bounds().origin());
+
+  return pos;
+}
+
 void Entry::setCaretPos(const int pos)
 {
   gfx::Size caretSize = theme()->getEntryCaretSize(this);
@@ -160,6 +169,8 @@ void Entry::setCaretPos(const int pos)
     startTimer();
   m_state = true;
 
+  os::System::instance()->setTextInput(true, caretPosOnScreen());
+
   invalidate();
 }
 
@@ -251,7 +262,7 @@ gfx::Rect Entry::getEntryTextBounds() const
   return onGetEntryTextBounds();
 }
 
-gfx::Rect Entry::getCharBoxBounds(const int i)
+gfx::Rect Entry::getCharBoxBounds(const int i) const
 {
   ASSERT(i >= 0 && i < int(m_boxes.size()));
   if (i >= 0 && i < int(m_boxes.size()))
@@ -288,8 +299,9 @@ bool Entry::onProcessMessage(Message* msg)
       }
 
       // Start processing dead keys
-      if (m_translate_dead_keys)
-        os::System::instance()->setTextInput(true);
+      if (m_translate_dead_keys) {
+        os::System::instance()->setTextInput(true, caretPosOnScreen());
+      }
       break;
 
     case kFocusLeaveMessage:

src/ui/entry.h

@@ -43,6 +43,7 @@ public:
 
   int caretPos() const { return m_caret; }
   int lastCaretPos() const;
+  gfx::Point caretPosOnScreen() const;
 
   void setCaretPos(int pos);
   void setCaretToEnd();
@@ -76,7 +77,7 @@ public:
   obs::signal<void()> Change;
 
 protected:
-  gfx::Rect getCharBoxBounds(int i);
+  gfx::Rect getCharBoxBounds(int i) const;
 
   // Events
   bool onProcessMessage(Message* msg) override;