fix: Increase scrollback buffer height for chat rendering (PAD_SIZE)

f27fa98 commit introduced issue of scrolling seemingly randomly being stuck and the following message flood in the logs: "WRN: Ncurses Overflow..."

A pad is an off-screen buffer — larger than the visible terminal screen — that you can scroll, render parts of, or update selectively.

Unlike regular windows, a pad is not tied to screen size. You can create a pad that's 1,000 lines tall, even if your terminal is only 40 lines tall.

This commit addresses the issue by increasing PAD_SIZE to a reasonable number,
allowing messages from buffer to be displayed without overflowing NCurses' window size (maxy).

Minor change: add .cache folder to gitignore

.gitignore

@@ -44,6 +44,9 @@ src/gitversion.h.in
 src/stamp-h1
 src/plugins/profapi.lo
 
+# clangd
+.cache/
+
 # out-of-tree build folders
 build*/
 

src/ui/window.c

@@ -62,7 +62,6 @@
 #include "xmpp/xmpp.h"
 #include "xmpp/roster_list.h"
 
-static const int PAD_SIZE = 100;
 static const char* LOADING_MESSAGE = "Loading older messages…";
 static const char* CONS_WIN_TITLE = "Profanity. Type /help for help information.";
 static const char* XML_WIN_TITLE = "XML Console";

src/ui/window.h

@@ -56,6 +56,9 @@
 #include "xmpp/contact.h"
 #include "xmpp/muc.h"
 
+// Max lines per window rendered by NCurses
+static const int PAD_SIZE = 10000;
+
 void win_move_to_end(ProfWin* window);
 void win_show_status_string(ProfWin* window, const char* const from,
                             const char* const show, const char* const status,