internal/ui: reland: bug fix: disable window size limitation on fullscreen

Closes #2260

internal/ui/ui_glfw.go

@@ -1324,6 +1324,14 @@ func (u *userInterfaceImpl) updateWindowSizeLimits() {
 	u.setWindowResizingModeForOS(u.windowResizingMode)
 }
 
+// disableWindowSizeLimits disables a window size limitation temporarily, especially for fullscreen
+// In order to enable the size limitation, call updateWindowSizeLimits.
+//
+// disableWindowSizeLimits must be called from the main thread.
+func (u *userInterfaceImpl) disableWindowSizeLimits() {
+	u.window.SetSizeLimits(glfw.DontCare, glfw.DontCare, glfw.DontCare, glfw.DontCare)
+}
+
 // adjustWindowSizeBasedOnSizeLimitsInDIP adjust the size based on the window size limits.
 // width and height are in device-independent pixels.
 func (u *userInterfaceImpl) adjustWindowSizeBasedOnSizeLimitsInDIP(width, height int) (int, int) {
@@ -1400,6 +1408,8 @@ func (u *userInterfaceImpl) setFullscreen(fullscreen bool) {
 
 	// Enter the fullscreen.
 	if fullscreen {
+		u.disableWindowSizeLimits()
+
 		if x, y := u.origWindowPos(); x == invalidPos || y == invalidPos {
 			u.setOrigWindowPos(u.window.GetPos())
 		}
@@ -1420,6 +1430,7 @@ func (u *userInterfaceImpl) setFullscreen(fullscreen bool) {
 	}
 
 	// Exit the fullscreen.
+	u.updateWindowSizeLimits()
 
 	// Get the original window position and size before changing the state of fullscreen.
 	// TODO: Why?

internal/ui/ui_glfw_darwin.go

@@ -136,6 +136,10 @@ func init() {
 				Cmd: sel_windowWillExitFullScreen,
 				Fn: func(id objc.ID, cmd objc.SEL, notification objc.ID) {
 					pushResizableState(id, cocoa.NSNotification{ID: notification}.Object())
+					// Even a window has a size limitation, a window can be fullscreen by calling SetFullscreen(true).
+					// In this case, the window size limitation is disabled temporarily.
+					// When exiting from fullscreen, reset the window size limitation.
+					theUI.updateWindowSizeLimits()
 				},
 			},
 			{