Always auto center on 'scratchpad show' if window hasn't been repositioned by the user

This change ensures a scratchpad window is still centered on the screen
if it has first been shown on another screen of a different
resolution. Moving or resizing the scratchpad manually disables this
behavior.

include/data.h

@@ -569,6 +569,8 @@ struct Con {
     /** callbacks */
     void(*on_remove_child)(Con *);
 
+    /** not a scratchpad window, auto centered scratchpad window, or
+     * user positioned scratchpad window. */
     enum {
         SCRATCHPAD_NONE = 0,
         SCRATCHPAD_FRESH = 1,

src/commands.c

@@ -592,6 +592,10 @@ static void cmd_resize_floating(I3_CMD, char *way, char *direction, Con *floatin
     } else if (strcmp(direction, "left") == 0) {
         floating_con->rect.x -= (floating_con->rect.width - old_rect.width);
     }
+
+    /* If this is a scratchpad window, don't auto center it from now on. */
+    if (floating_con->scratchpad_state == SCRATCHPAD_FRESH)
+        floating_con->scratchpad_state = SCRATCHPAD_CHANGED;
 }
 
 static bool cmd_resize_tiling_direction(I3_CMD, Con *current, char *way, char *direction, int ppt) {

src/floating.c

@@ -438,6 +438,11 @@ void floating_drag_window(Con *con, const xcb_button_press_event_t *event) {
 
     /* Drag the window */
     drag_pointer(con, event, XCB_NONE, BORDER_TOP /* irrelevant */, XCURSOR_CURSOR_MOVE, drag_window_callback, event);
+
+    /* If this is a scratchpad window, don't auto center it from now on. */
+    if (con->scratchpad_state == SCRATCHPAD_FRESH)
+        con->scratchpad_state = SCRATCHPAD_CHANGED;
+
     tree_render();
 }
 
@@ -537,6 +542,10 @@ void floating_resize_window(Con *con, const bool proportional,
     struct resize_window_callback_params params = { corner, proportional, event };
 
     drag_pointer(con, event, XCB_NONE, BORDER_TOP /* irrelevant */, cursor, resize_window_callback, &params);
+
+    /* If this is a scratchpad window, don't auto center it from now on. */
+    if (con->scratchpad_state == SCRATCHPAD_FRESH)
+        con->scratchpad_state = SCRATCHPAD_CHANGED;
 }
 
 /*
@@ -660,6 +669,11 @@ void floating_reposition(Con *con, Rect newrect) {
     con->rect = newrect;
 
     floating_maybe_reassign_ws(con);
+
+    /* If this is a scratchpad window, don't auto center it from now on. */
+    if (con->scratchpad_state == SCRATCHPAD_FRESH)
+        con->scratchpad_state = SCRATCHPAD_CHANGED;
+
     tree_render();
 }
 

src/scratchpad.c

@@ -178,7 +178,6 @@ void scratchpad_show(Con *con) {
                       ((output->rect.width / 2.0) - (con->rect.width / 2.0));
         con->rect.y = output->rect.y +
                       ((output->rect.height / 2.0) - (con->rect.height / 2.0));
-        con->scratchpad_state = SCRATCHPAD_CHANGED;
     }
 
     /* Activate active workspace if window is from another workspace to ensure

testcases/t/185-scratchpad.t

@@ -93,8 +93,7 @@ is(scalar @{$__i3_scratch->{floating_nodes}}, 0, '__i3_scratch ws empty');
 ################################################################################
 # 3: Verify that 'scratchpad toggle' sends a window to the __i3_scratch
 # workspace and sets the scratchpad flag to SCRATCHPAD_FRESH. The window’s size
-# and position will be changed (once!) on the next 'scratchpad show' and the
+# and position will be changed on the next 'scratchpad show'.
-# flag will be changed to SCRATCHPAD_CHANGED.
 ################################################################################
 
 my ($nodes, $focus) = get_ws_content($tmp);
@@ -165,10 +164,33 @@ $__i3_scratch = get_ws('__i3_scratch');
 @scratch_nodes = @{$__i3_scratch->{floating_nodes}};
 is(scalar @scratch_nodes, 1, '__i3_scratch contains our window');
 
-is($scratch_nodes[0]->{scratchpad_state}, 'changed', 'scratchpad_state changed');
+################################################################################
+# 6: Resizing the window should disable auto centering on scratchpad show
+################################################################################
+
+cmd 'scratchpad show';
+
+$ws = get_ws($tmp);
+is($ws->{floating_nodes}->[0]->{scratchpad_state}, 'fresh',
+   'scratchpad_state fresh');
+
+cmd 'resize grow width 10 px';
+cmd 'scratchpad show';
+cmd 'scratchpad show';
+
+$ws = get_ws($tmp);
+$scratchrect = $ws->{floating_nodes}->[0]->{rect};
+$outputrect = $output->{rect};
+
+is($ws->{floating_nodes}->[0]->{scratchpad_state}, 'changed',
+   'scratchpad_state changed');
+is($scratchrect->{width}, $outputrect->{width} * 0.5 + 10, 'scratch width is 50% + 10px');
+
+cmd 'resize shrink width 10 px';
+cmd 'scratchpad show';
 
 ################################################################################
-# 6: Verify that repeated 'scratchpad show' cycle through the stack, that is,
+# 7: Verify that repeated 'scratchpad show' cycle through the stack, that is,
 # toggling a visible window should insert it at the bottom of the stack of the
 # __i3_scratch workspace.
 ################################################################################