From fb56dcbad94b7606d67cd911ea2c8784bcd8a247 Mon Sep 17 00:00:00 2001
From: Michael Brumlow <mbrumlow@gmail.com>
Date: Sat, 7 Jan 2017 18:07:03 -0600
Subject: [PATCH] Fixing resize crashes.

Most of the crashes on resize were due to columns and lines being set to
zero. This causes all sorts of other checks within the code to ensure
these values are greater than zero before running calculations. To avoid
this we just need to ensure that lines and columns are some non zero
value. This is seems to be what gnome terminal does. I have selected
2 lines and two columns for min terminal size for now.
---
 src/term/mod.rs | 24 ++++++++++++++++++------
 1 file changed, 18 insertions(+), 6 deletions(-)

diff --git a/src/term/mod.rs b/src/term/mod.rs
index 73f9ad61..68fd8223 100644
--- a/src/term/mod.rs
+++ b/src/term/mod.rs
@@ -475,8 +475,8 @@ impl Term {
 
         let old_cols = self.size_info.cols();
         let old_lines = self.size_info.lines();
-        let num_cols = size.cols();
-        let num_lines = size.lines();
+        let mut num_cols = size.cols();
+        let mut num_lines = size.lines();
 
         self.size_info = size;
 
@@ -484,6 +484,16 @@ impl Term {
             return;
         }
 
+        // Should not allow less than 1 col, causes all sorts of checks to be required. 
+        if num_cols <= Column(1) {
+            num_cols = Column(2); 
+        }
+
+        // Should not allow less than 1 line, causes all sorts of checks to be required. 
+        if num_lines <= Line(1) {
+            num_lines = Line(2); 
+        }
+
         // Scroll up to keep cursor and as much context as possible in grid.
         // This only runs when the lines decreases.
         self.scroll_region = Line(0)..self.grid.num_lines();
@@ -513,10 +523,12 @@ impl Term {
 
         self.tabs[0] = false;
 
-        // Make sure bottom of terminal is clear
-        let template = self.empty_cell;
-        self.grid.clear_region((self.cursor.line).., |c| c.reset(&template));
-        self.alt_grid.clear_region((self.cursor.line).., |c| c.reset(&template));
+        if num_lines > old_lines {
+            // Make sure bottom of terminal is clear
+            let template = self.empty_cell;
+            self.grid.clear_region((self.cursor.line + 1).., |c| c.reset(&template));
+            self.alt_grid.clear_region((self.cursor.line + 1).., |c| c.reset(&template));
+        }
 
         // Reset scrolling region to new size
         self.scroll_region = Line(0)..self.grid.num_lines();