Move terminal-related selection logic into st.c

The front-end determines information about mouse clicks and motion, and
the terminal handles the actual selection start/extend/dirty logic by
row and column.

While we're in the neighborhood, we'll also rename getbuttoninfo() to
mousesel() which is, at least, less wrong.

Signed-off-by: Devin J. Pohly <djpohly@gmail.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/st.h b/st.h
index 79dd47e..c5ff5cf 100644
--- a/st.h
+++ b/st.h
@@ -172,7 +172,6 @@ void toggleprinter(const Arg *);
 int tattrset(int);
 void tnew(int, int);
 void tresize(int, int);
-void tsetdirt(int, int);
 void tsetdirtattr(int);
 void ttynew(char *, char *, char **);
 size_t ttyread(void);
@@ -184,6 +183,8 @@ void resettitle(void);
 
 void selclear(void);
 void selinit(void);
+void selstart(int, int, int);
+void selextend(int, int, int);
 void selnormalize(void);
 int selected(int, int);
 char *getsel(void);