[LyX/master] Fix warnings by using size_t as the loop variable.

[Richard Kimberly Heck]

commit 5f5cb7eea7b70efea6831cee023d2093b4ffca82
Author: Richard Kimberly Heck <rikih...@lyx.org>
Date:   Sun May 3 15:02:40 2020 -0400

    Fix warnings by using size_t as the loop variable.
---
 src/support/lstrings.cpp |   12 ++++++------
 1 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/src/support/lstrings.cpp b/src/support/lstrings.cpp
index 55e66ce..88aa1e0 100644
--- a/src/support/lstrings.cpp
+++ b/src/support/lstrings.cpp
@@ -406,13 +406,13 @@ bool isHexChar(char_type c)
 
 bool isHex(docstring const & str)
 {
-       int index = 0;
+       size_t index = 0;
 
        if (str.length() > 2 && str[0] == '0' &&
            (str[1] == 'x' || str[1] == 'X'))
                index = 2;
 
-       int const len = str.length();
+       size_t const len = str.length();
 
        for (; index < len; ++index) {
                if (!isHexChar(str[index]))
@@ -433,8 +433,8 @@ unsigned int hexToInt(docstring const & str)
 
 bool isAscii(docstring const & str)
 {
-       int const len = str.length();
-       for (int i = 0; i < len; ++i)
+       size_t const len = str.length();
+       for (size_t i = 0; i < len; ++i)
                if (str[i] >= 0x80)
                        return false;
        return true;
@@ -443,8 +443,8 @@ bool isAscii(docstring const & str)
 
 bool isAscii(string const & str)
 {
-       int const len = str.length();
-       for (int i = 0; i < len; ++i)
+       size_t const len = str.length();
+       for (size_t i = 0; i < len; ++i)
                if (static_cast<unsigned char>(str[i]) >= 0x80)
                        return false;
        return true;
-- 
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