[hackers] [st] selextend: clarify: !sel.mode == SEL_IDLE || Hiltjo Posthuma

[git]

commit 6ac8c8aa50d521f82d491ab54eb972660fdf3207
Author:     Hiltjo Posthuma <hil...@codemadness.org>
AuthorDate: Sat Mar 17 13:48:29 2018 +0100
Commit:     Hiltjo Posthuma <hil...@codemadness.org>
CommitDate: Sat Mar 17 13:48:29 2018 +0100

    selextend: clarify: !sel.mode == SEL_IDLE

diff --git a/st.c b/st.c
index 581647b..46c954b 100644
--- a/st.c
+++ b/st.c
@@ -461,7 +461,7 @@ selextend(int col, int row, int type, int done)
 {
        int oldey, oldex, oldsby, oldsey, oldtype;
 
-       if (!sel.mode)
+       if (sel.mode == SEL_IDLE)
                return;
        if (done && sel.mode == SEL_EMPTY) {
                selclear();