Resolve -Wimplicit-int-conversion warnings

Panel.c:414:49: error: implicit conversion loses integer precision: 'int' to 'short' [-Werror,-Wimplicit-int-conversion]
      this->scrollH = MAXIMUM(this->selectedLen - this->w, 0);
                    ~         ~~~~~~~~~~~~~~~~~~^~~~~~~~~
./Macros.h:11:54: note: expanded from macro 'MAXIMUM'
#define MAXIMUM(a, b)                  ((a) > (b) ? (a) : (b))
                                                     ^

IncSet.c:159:38: error: implicit conversion loses integer precision: 'int' to 'char' [-Werror,-Wimplicit-int-conversion]
         mode->buffer[mode->index] = ch;
                                   ~ ^~

Panel.c:456:24: error: implicit conversion loses integer precision: 'int' to 'char' [-Werror,-Wimplicit-int-conversion]
         buffer[len] = ch;
                     ~ ^~
Panel.c:473:22: error: implicit conversion loses integer precision: 'int' to 'char' [-Werror,-Wimplicit-int-conversion]
         buffer[0] = ch;
                   ~ ^~

1 files changed, 2 insertions, 2 deletions

diff --git a/Panel.c b/Panel.c
index 64e6d4e6..a5773d52 100644
--- a/Panel.c
+++ b/Panel.c
@@ -453,7 +453,7 @@ HandlerResult Panel_selectByTyping(Panel* this, int ch) {
       }
 
       if (len < 99) {
-         buffer[len] = ch;
+         buffer[len] = (char) ch;
          buffer[len + 1] = '\0';
       }
 
@@ -470,7 +470,7 @@ HandlerResult Panel_selectByTyping(Panel* this, int ch) {
 
          // if current word did not match,
          // retry considering the character the start of a new word.
-         buffer[0] = ch;
+         buffer[0] = (char) ch;
          buffer[1] = '\0';
       }