JobStatusDisplay: introduce MAX_DISPLAY_WIDTH constant

Values that belong together and may only be changed at the same time
should be combined in a common constant. So let's do this.

Signed-off-by: Florian Schmaus <flow@gentoo.org>

lib/_emerge/JobStatusDisplay.py

@@ -16,6 +16,8 @@
 
 
 class JobStatusDisplay:
+    MAX_DISPLAY_WIDTH = 100
+
     _bound_properties = ("curval", "failed", "running")
 
     # Don't update the display unless at least this much
@@ -65,14 +67,14 @@ def __init__(self, quiet=False, xterm_titles=True):
         if self._isatty:
             width = portage.output.get_term_size()[1]
         else:
-            width = 100
+            width = MAX_DISPLAY_WIDTH
         self._set_width(width)
 
     def _set_width(self, width):
         if width == getattr(self, "width", None):
             return
-        if width <= 0 or width > 100:
-            width = 100
+        if width <= 0 or width > MAX_DISPLAY_WIDTH:
+            width = MAX_DISPLAY_WIDTH
         object.__setattr__(self, "width", width)
         object.__setattr__(self, "_jobs_column_width", width - 32)