[gimp] app: pause/resume active tool when rotating canvas

[Ell <ell src gnome org>]

commit cd5e4e99dd2f3ec4dae5425cd2bfe647f161061e
Author: Ell <ell_se yahoo com>
Date:   Thu May 14 23:01:12 2020 +0300

    app: pause/resume active tool when rotating canvas
    
    In GimpDisplayShell, pause and restore the active tool when
    rotating the canvas, similarly to scrolling and scaling.

 app/display/gimpdisplayshell-rotate.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)
---
diff --git a/app/display/gimpdisplayshell-rotate.c b/app/display/gimpdisplayshell-rotate.c
index 2049ba2dc9..33f085e04b 100644
--- a/app/display/gimpdisplayshell-rotate.c
+++ b/app/display/gimpdisplayshell-rotate.c
@@ -69,6 +69,9 @@ gimp_display_shell_flip (GimpDisplayShell *shell,
       /* Maintain the current center of the viewport. */
       gimp_display_shell_save_viewport_center (shell, &cx, &cy);
 
+      /* freeze the active tool */
+      gimp_display_shell_pause (shell);
+
       /* Adjust the rotation angle so that the image gets reflected across the
        * horizontal, and/or vertical, axes in screen space, regardless of the
        * current rotation.
@@ -89,6 +92,9 @@ gimp_display_shell_flip (GimpDisplayShell *shell,
 
       gimp_display_shell_expose_full (shell);
       gimp_display_shell_render_invalidate_full (shell);
+
+      /* re-enable the active tool */
+      gimp_display_shell_resume (shell);
     }
 }
 
@@ -119,6 +125,9 @@ gimp_display_shell_rotate_to (GimpDisplayShell *shell,
 
   shell->rotate_angle = value;
 
+  /* freeze the active tool */
+  gimp_display_shell_pause (shell);
+
   gimp_display_shell_scroll_clamp_and_update (shell);
 
   gimp_display_shell_rotated (shell);
@@ -127,6 +136,9 @@ gimp_display_shell_rotate_to (GimpDisplayShell *shell,
 
   gimp_display_shell_expose_full (shell);
   gimp_display_shell_render_invalidate_full (shell);
+
+  /* re-enable the active tool */
+  gimp_display_shell_resume (shell);
 }
 
 void