gaps: remove duplicate inner gaps

include/sway/tree/container.h

@@ -104,7 +104,12 @@ struct sway_container {
 	bool border_right;
 
 	// The gaps currently applied to the container.
-	double current_gaps;
+	struct {
+		int top;
+		int right;
+		int bottom;
+		int left;
+	} current_gaps;
 
 	struct sway_workspace *workspace; // NULL when hidden in the scratchpad
 	struct sway_container *parent;    // NULL if container in root of workspace

sway/tree/container.c

@@ -1009,19 +1009,25 @@ void container_discover_outputs(struct sway_container *con) {
 }
 
 void container_remove_gaps(struct sway_container *c) {
-	if (c->current_gaps == 0) {
+	if (c->current_gaps.top == 0 && c->current_gaps.right == 0 &&
+			c->current_gaps.bottom == 0 && c->current_gaps.left == 0) {
 		return;
 	}
 
-	c->width += c->current_gaps * 2;
-	c->height += c->current_gaps * 2;
-	c->x -= c->current_gaps;
-	c->y -= c->current_gaps;
-	c->current_gaps = 0;
+	c->width += c->current_gaps.left + c->current_gaps.right;
+	c->height += c->current_gaps.top + c->current_gaps.bottom;
+	c->x -= c->current_gaps.left;
+	c->y -= c->current_gaps.top;
+
+	c->current_gaps.top = 0;
+	c->current_gaps.right = 0;
+	c->current_gaps.bottom = 0;
+	c->current_gaps.left = 0;
 }
 
 void container_add_gaps(struct sway_container *c) {
-	if (c->current_gaps > 0) {
+	if (c->current_gaps.top > 0 || c->current_gaps.right > 0 ||
+			c->current_gaps.bottom > 0 || c->current_gaps.left > 0) {
 		return;
 	}
 	// Linear containers don't have gaps because it'd create double gaps
@@ -1054,11 +1060,15 @@ void container_add_gaps(struct sway_container *c) {
 
 	struct sway_workspace *ws = c->workspace;
 
-	c->current_gaps = ws->gaps_inner;
-	c->x += c->current_gaps;
-	c->y += c->current_gaps;
-	c->width -= 2 * c->current_gaps;
-	c->height -= 2 * c->current_gaps;
+	c->current_gaps.top = c->y == ws->y ? ws->gaps_inner : 0;
+	c->current_gaps.right = ws->gaps_inner;
+	c->current_gaps.bottom = ws->gaps_inner;
+	c->current_gaps.left = c->x == ws->x ? ws->gaps_inner : 0;
+
+	c->x += c->current_gaps.left;
+	c->y += c->current_gaps.top;
+	c->width -= c->current_gaps.left + c->current_gaps.right;
+	c->height -= c->current_gaps.top + c->current_gaps.bottom;
 }
 
 enum sway_container_layout container_parent_layout(struct sway_container *con) {

sway/tree/view.c

@@ -185,7 +185,8 @@ bool view_is_only_visible(struct sway_view *view) {
 static bool gaps_to_edge(struct sway_view *view) {
 	struct sway_container *con = view->container;
 	while (con) {
-		if (con->current_gaps > 0) {
+		if (con->current_gaps.top > 0 || con->current_gaps.right > 0 ||
+				con->current_gaps.bottom > 0 || con->current_gaps.left > 0) {
 			return true;
 		}
 		con = con->parent;
@@ -222,15 +223,15 @@ void view_autoconfigure(struct sway_view *view) {
 	if (config->hide_edge_borders == E_BOTH
 			|| config->hide_edge_borders == E_VERTICAL
 			|| (smart && !other_views && no_gaps)) {
-		con->border_left = con->x - con->current_gaps != ws->x;
-		int right_x = con->x + con->width + con->current_gaps;
+		con->border_left = con->x - con->current_gaps.left != ws->x;
+		int right_x = con->x + con->width + con->current_gaps.right;
 		con->border_right = right_x != ws->x + ws->width;
 	}
 	if (config->hide_edge_borders == E_BOTH
 			|| config->hide_edge_borders == E_HORIZONTAL
 			|| (smart && !other_views && no_gaps)) {
-		con->border_top = con->y - con->current_gaps != ws->y;
-		int bottom_y = con->y + con->height + con->current_gaps;
+		con->border_top = con->y - con->current_gaps.top != ws->y;
+		int bottom_y = con->y + con->height + con->current_gaps.bottom;
 		con->border_bottom = bottom_y != ws->y + ws->height;
 	}