[hackers] [st] Update XIM cursor position only if changed || Ivan Tham

[git]

commit 72e3f6c7c05b4d5b56388508bb20a863aec279f5
Author:     Ivan Tham <pickf...@riseup.net>
AuthorDate: Sun Apr 19 19:38:39 2020 +0200
Commit:     Hiltjo Posthuma <hil...@codemadness.org>
CommitDate: Sun Apr 19 19:39:48 2020 +0200

    Update XIM cursor position only if changed
    
    Updating XIM cursor position is expensive, so only update it when cursor
    position changed.

diff --git a/st.c b/st.c
index 9e568c6..0ce6ac2 100644
--- a/st.c
+++ b/st.c
@@ -2571,6 +2571,7 @@ void
 drawregion(int x1, int y1, int x2, int y2)
 {
        int y;
+
        for (y = y1; y < y2; y++) {
                if (!term.dirty[y])
                        continue;
@@ -2583,7 +2584,7 @@ drawregion(int x1, int y1, int x2, int y2)
 void
 draw(void)
 {
-       int cx = term.c.x;
+       int cx = term.c.x, ocx = term.ocx, ocy = term.ocy;
 
        if (!xstartdraw())
                return;
@@ -2599,9 +2600,11 @@ draw(void)
        drawregion(0, 0, term.col, term.row);
        xdrawcursor(cx, term.c.y, term.line[term.c.y][cx],
                        term.ocx, term.ocy, term.line[term.ocy][term.ocx]);
-       term.ocx = cx, term.ocy = term.c.y;
+       term.ocx = cx;
+       term.ocy = term.c.y;
        xfinishdraw();
-       xximspot(term.ocx, term.ocy);
+       if (ocx != term.ocx || ocy != term.ocy)
+               xximspot(term.ocx, term.ocy);
 }
 
 void