eeshow/: Esc cancels current action

eeshow/README

@@ -175,6 +175,8 @@ PgUp			go to the previous sheet in sequence
 PgDn			go to the next sheet in sequence
 Up or Down		invoke the revision history (WIP)
 Tab			toggle between old and new revision
+Esc			cancel current action (exit history, close pop-up,
+			de-highlight glabel, close help)
 H			show/hide help window
 D			when comparing revisions, show difference (default)
 N			show newer sheet

eeshow/TODO

@@ -49,6 +49,8 @@ GUI:
   to new_sheet and old_sheet.
 - introduce location string, as command-line argument, e.g.,
   [top-sheet/]rev-old,rev-new[,x,y[,zoom]]
+  or maybe (allowing for sheets from completely different sources):
+  [revA]:[topA]:[sheetA][,[revB]:[topB]:[sheetB]][@x,y[,zoom]]
 - set/use location string via clipboard
 
 GUI/history

eeshow/gui/help.c

@@ -38,6 +38,7 @@ static gboolean key_press_event(GtkWidget *widget, GdkEventKey *event,
 	switch (event->keyval) {
 	case GDK_KEY_h:
 	case GDK_KEY_q:
+	case GDK_KEY_Escape:
 		gtk_widget_hide(window);
 		visible = 0;
 		break;

eeshow/gui/history.c

@@ -232,7 +232,12 @@ static void history_drag_move(void *user, int dx, int dy)
 
 static void history_key(void *user, int x, int y, int keyval)
 {
+	struct gui_ctx *ctx = user;
+
 	switch (keyval) {
+	case GDK_KEY_Escape:
+		hide_history(ctx);
+		break;
 	case GDK_KEY_q:
 		gtk_main_quit();
 	}

eeshow/gui/sheet.c

@@ -516,6 +516,12 @@ static void sheet_key(void *user, int x, int y, int keyval)
 		toggle_old_new(ctx);
 		break;
 
+	case GDK_KEY_Escape:
+		dehover_glabel(user);
+		ctx->glabel = NULL;
+		redraw(ctx);
+		break;
+
 	case GDK_KEY_n:
 		ctx->diff_mode = diff_new;
 		redraw(ctx);

eeshow/help.html

@@ -28,6 +28,10 @@
   <TR>
     <TD>Tab
     <TD>toggle between old and new revision
+  <TR>
+    <TD>Esc
+    <TD>cancel current action (exit history, close pop-up, 
+	de-highlight glabel, close help)
   <TR>
     <TD>H
     <TD>open/close help window

eeshow/help.txt

@@ -9,6 +9,8 @@ PgUp        go to the previous sheet in sequence
 PgDn        go to the next sheet in sequence
 Up or Down  invoke the revision history (WIP)
 Tab         toggle between old and new revision
+Esc         cancel current action (exit history, close
+            pop-up, de-highlight glabel, close help)
 H           show/hide help window
 D           when comparing revisions, show difference
 N           show newer sheet