Fix touchscreen taps being dropped on custom Button widgets

src/slic3r/GUI/TabButton.cpp

@@ -218,8 +218,11 @@ void TabButton::mouseReleased(wxMouseEvent &event)
     event.Skip();
     if (pressedDown) {
         pressedDown = false;
-        ReleaseMouse();
-        if (wxRect({0, 0}, GetSize()).Contains(event.GetPosition()))
+        if (HasCapture())
+            ReleaseMouse();
+        // Touch input drift slop — see Button::mouseReleased.
+        constexpr int kReleaseSlop = 15;
+        if (wxRect({0, 0}, GetSize()).Inflate(kReleaseSlop).Contains(event.GetPosition()))
             sendButtonEvent();
     }
 }

src/slic3r/GUI/Widgets/AxisCtrlButton.cpp

@@ -297,8 +297,14 @@ void AxisCtrlButton::mouseReleased(wxMouseEvent& event)
     event.Skip();
     if (pressedDown) {
         pressedDown = false;
-        ReleaseMouse();
-        if (wxRect({ 0, 0 }, GetSize()).Contains(event.GetPosition()))
+        if (HasCapture())
+            ReleaseMouse();
+        // Touch input drift slop — see Button::mouseReleased. The active
+        // wedge is tracked in current_pos by mouseMove, so the correct
+        // axis still fires; the slop just keeps the click alive when a
+        // touch lands a few pixels outside the wedge ring on release.
+        constexpr int kReleaseSlop = 15;
+        if (wxRect({ 0, 0 }, GetSize()).Inflate(kReleaseSlop).Contains(event.GetPosition()))
             sendButtonEvent();
     }
 }

src/slic3r/GUI/Widgets/Button.cpp

@@ -411,7 +411,18 @@ void Button::mouseReleased(wxMouseEvent& event)
         pressedDown = false;
         if (HasCapture())
             ReleaseMouse();
-        if (wxRect({0, 0}, GetSize()).Contains(event.GetPosition()))
+        // Touch input drift slop. The button-up position can land a few
+        // pixels outside the rect after a tap because finger contact rolls
+        // between press and release; the original strict
+        // wxRect({0,0},GetSize()).Contains(...) check silently dropped
+        // those clicks on every touchscreen device (visible symptom on
+        // Cancel buttons, AMS spool selectors, sidebar tabs, etc.).
+        // Inflating the hit area by kReleaseSlop on each side preserves
+        // the deliberate drag-off-to-cancel gesture for desktop mouse
+        // users (any release more than ~15 px outside still cancels)
+        // while accepting the small finger drift typical of touchscreens.
+        constexpr int kReleaseSlop = 15;
+        if (wxRect({0, 0}, GetSize()).Inflate(kReleaseSlop).Contains(event.GetPosition()))
             sendButtonEvent();
     }
 }

src/slic3r/GUI/Widgets/SideButton.cpp

@@ -338,7 +338,9 @@ void SideButton::mouseReleased(wxMouseEvent& event)
 
     if (pressedDown) {
         pressedDown = false;
-        if (wxRect({0, 0}, GetSize()).Contains(event.GetPosition()))
+        // Touch input drift slop — see Button::mouseReleased.
+        constexpr int kReleaseSlop = 15;
+        if (wxRect({0, 0}, GetSize()).Inflate(kReleaseSlop).Contains(event.GetPosition()))
             sendButtonEvent();
     }
 }